what is standard error of the mean? The chefs at a local pizza chain in Cambria California, strive to maintain the suggested size of their 16- inch pizzas. Despite their best efforts, they are unable to make every pizza exactly 16 inches in diameter. The manager had determined that the size of the pizzas is normally distributed with a mean of 16 inches and a population standard deviation of 0.8 inch. What are the expected value and the standard error of the sample mean derived from a random sample of 2 pizzas? What are the expected value and the standard error of the sample mean derived from a random sample of 4 pizzas? Compare the expected value and the standard error of the sample mean with those of an individual pizza. What is the probability that 2 randomly selected pizzas average less than 15.5 inches? What is the probability that 4 randomly selected pizzas average greater than 15.5 inches?

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